Basics of NavigationAir Navigation — DGCA CPL practice questions

Question 1 of 110

One degree of latitude is equal to:

A.60 nautical miles

B.60 statute miles

C.60 kilometres

D.100 nautical miles

All 110 questions — Basics of Navigation

Air Navigation · DGCA CPL. The correct option is marked on each.

Q1. One degree of latitude is equal to:
- A.60 nautical miles✓
- B.60 statute miles
- C.60 kilometres
- D.100 nautical miles
Why: The Earth is divided into 360°. One degree of latitude = 60 NM = 1° × 60 minutes, each minute = 1 NM by definition.
Q2. A great circle is defined as:
- A.Any circle drawn on the Earth's surface
- B.A circle whose plane passes through the centre of the Earth✓
- C.A circle connecting points of equal latitude
- D.The circle connecting points of equal longitude
Why: A great circle has its plane passing through the Earth's centre — it divides the globe into two equal hemispheres and represents the shortest surface path between two points.
Q3. A rhumb line on the Earth's surface:
- A.Is always the shortest distance between two points
- B.Crosses all meridians at the same angle✓
- C.Is identical to a great circle at the equator only
- D.Curves toward the poles on a Lambert chart
Why: A rhumb line (loxodrome) cuts all meridians at a constant angle, making it convenient for navigation but not the shortest route (except along equator or meridians).
Q4. The angular distance of a point measured north or south of the equator is:
- A.Longitude
- B.Latitude✓
- C.Declination
- D.Altitude
Why: Latitude is the angular distance north or south of the equator (0° to 90°). Longitude is measured east or west of the prime meridian.
Q5. The prime meridian (0° longitude) passes through:
- A.Paris, France
- B.Athens, Greece
- C.Greenwich, England✓
- D.Washington DC, USA
Why: By international agreement, the prime meridian passes through the Royal Observatory at Greenwich, England.
Q6. True North is defined as the direction toward:
- A.Magnetic North Pole
- B.Geographic North Pole (spin axis)✓
- C.The point of highest magnetic intensity
- D.Celestial North Pole
Why: True North points to the geographic North Pole — the point through which the Earth's rotational axis exits the surface.
Q7. The circumference of the Earth is approximately:
- A.21,600 NM✓
- B.24,000 NM
- C.30,000 NM
- D.18,000 NM
Why: 360° × 60 NM/degree = 21,600 NM. This is why one nautical mile was defined as one minute of arc of a great circle.
Q8. Convergency of meridians is greatest at:
- A.The equator
- B.45° latitude
- C.The poles✓
- D.The prime meridian
Why: All meridians converge and meet at the geographic poles. Convergency is zero at the equator and maximum (90°) at the poles.
Q9. The angle between True North and Grid North on a chart is called:
- A.Magnetic variation
- B.Compass deviation
- C.Convergency✓
- D.Grivation
Why: The angle between True North and Grid North is convergency (also called conversion angle in the context of great-circle to rhumb-line). Grivation is the combined variation + convergency used to convert from grid to magnetic.
Q10. Local Mean Time (LMT) differs from UTC by 4 minutes for every:
- A.1° of latitude
- B.1° of longitude✓
- C.15° of longitude
- D.1 NM
Why: The Earth rotates 360° in 24 hours = 1° per 4 minutes. LMT changes by 4 minutes for every 1° of longitude east or west of the reference meridian.
Q11. What is the approximate compression (flattening) of the Earth?
- A.3%
- B.0.03%
- C.0.3%✓
- D.1/3000
Why: The Earth's compression (ellipticity) is approximately 1/297, which is about 0.3%. This means the polar radius is slightly less than the equatorial radius.
Q12. A Graticule is the name given to:
- A.A series of lines drawn on a chart
- B.A series of Latitude and Longitude lines drawn on a chart or map✓
- C.A selection of small circles as you get nearer to either pole
- D.The intersection of rhumb lines on a Mercator chart
Why: The graticule is specifically the network of latitude and longitude lines (parallels and meridians) drawn on a chart or map, forming the geographic reference grid.
Q13. Given that the compression value of the Earth is 1/297 and that the semi-major axis measured at the Equator is 6378.4 km, what is the semi-minor axis measured at the Poles?
- A.6399.9 km
- B.6356.9 km✓
- C.6378.4 km
- D.6367.0 km
Why: The polar radius = equatorial radius × (296/297) = 6378.4 × 0.99663 ≈ 6356.9 km. The Earth is slightly flattened at the poles.
Q14. An ICAO nautical mile is defined as:
- A.6080 feet
- B.1852 metres✓
- C.1863 feet
- D.6062 feet
Why: The international (ICAO) nautical mile is defined as exactly 1852 metres. This replaced the older UK definition of 6080 feet.
Q15. Any Meridian Line is a:
- A.Rhumb Line
- B.Semi Great Circle
- C.Rhumb Line and a semi Great Circle✓
- D.Small circle
Why: Every meridian is both a semi-great circle (it forms half of a great circle with its anti-meridian) and a rhumb line (it cuts all parallels at 90°, a constant angle).
Q16. A Rhumb Line cuts all meridians at the same angle. This gives:
- A.The shortest distance between two points
- B.A line which could never be a Great Circle track
- C.A line of constant direction✓
- D.A line always curving towards the equator
Why: The defining property of a rhumb line is that it crosses all meridians at the same angle, giving a line of constant (unchanging) direction — very useful for compass navigation.
Q17. What is the position of the Rhumb Line between two points relative to the Great Circle between the same points if the points are in the Northern hemisphere?
- A.The rhumb line lies south of (nearer the equator than) the great circle✓
- B.The rhumb line lies north of (nearer the pole than) the great circle
- C.They are the same line
- D.The rhumb line lies east of the great circle
Why: In the Northern hemisphere, the great circle curves toward the pole (northward), so it always lies closer to the pole than the rhumb line. The rhumb line lies nearer the equator.
Q18. What is the maximum difference between geodetic and geocentric latitude?
- A.At 45° North and South✓
- B.At 90° North and South
- C.At 60° North and South
- D.At 0° (Equator)
Why: The difference between geodetic latitude (measured from the normal to the ellipsoid) and geocentric latitude (measured from Earth's centre) is maximum at about 45° latitude, where it reaches approximately 11.5 arc minutes.
Q19. Departure is defined as:
- A.The great circle distance between two points on the same meridian
- B.The distance between two meridians along a specified parallel of latitude✓
- C.The departure angle from a runway heading
- D.The change in longitude converted to nautical miles
Why: Departure is the east-west distance between two meridians measured along a specified parallel of latitude, expressed in nautical miles. It equals change-of-longitude (in minutes) × cosine latitude.
Q20. Departure varies with latitude as the:
- A.Sine of the latitude
- B.Cosine of the latitude✓
- C.Tangent of the latitude
- D.Secant of the latitude
Why: Departure = change of longitude (minutes) × cosine latitude. Departure is maximum at the equator (cos 0° = 1) and zero at the poles (cos 90° = 0), varying as the cosine of latitude.
Q21. At what latitude is the departure between two meridians equal to half their difference of longitude in minutes?
- A.0° (Equator)
- B.30° N/S
- C.45° N/S
- D.60° N/S✓
Why: Departure = ch.long (min) × cos lat. For departure to equal half the ch.long, cos lat must equal 0.5, which occurs at 60° N or S.
Q22. When does perihelion (Earth closest to the Sun) occur?
- A.Early January✓
- B.Mid March
- C.Early July
- D.September 21
Why: Perihelion occurs around January 4th each year, when the Earth is at its closest point to the Sun in its elliptical orbit. Aphelion (furthest from Sun) occurs around July 4th.
Q23. When do the equinoxes occur?
- A.December and June
- B.February and November
- C.March and September✓
- D.January and July
Why: The equinoxes occur around 21 March (Spring/Vernal equinox in NH) and 21 September (Autumn equinox in NH). At these times the Sun is overhead the equator and day and night are approximately equal length globally.
Q24. When it is the Winter Solstice in the Southern hemisphere, the Declination of the Sun is:
- A.0°N/S
- B.23.5°N✓
- C.66.5°N
- D.23.5°S
Why: The Southern hemisphere Winter Solstice is the same date as the Northern hemisphere Summer Solstice (around June 21). At this time the Sun's declination is 23.5°N — the Sun is overhead the Tropic of Cancer.
Q25. What is the angle between the plane of the Equator (Equinoctial) and the plane of the Ecliptic?
- A.66.5°
- B.23.5°✓
- C.Varies between 23.5°N and 23.5°S
- D.Varies between 66.5°N and 66.5°S
Why: The Earth's axis is tilted 23.5° from the perpendicular to its orbital plane. This means the plane of the equator is inclined at 23.5° to the plane of the ecliptic (Earth's orbital plane). This tilt causes the seasons.
Q26. A sidereal day is:
- A.Longer than an apparent solar day
- B.Longer than a real solar day
- C.Shorter than an apparent solar day✓
- D.Equal to a real solar day
Why: A sidereal day (measured against a distant star, ~23h 56m) is shorter than an apparent solar day (measured against the Sun, ~24h). This is because in addition to rotating 360°, the Earth must rotate slightly further each day to compensate for its orbital motion around the Sun.
Q27. The maximum difference between mean time and apparent (real Sun) time occurs in which months?
- A.January and July
- B.March and September
- C.November and February✓
- D.December and June
Why: The Equation of Time (difference between mean noon and apparent noon) reaches its maximum values of about 16 minutes in November and about 14 minutes in February. These are the months when real noon differs most from 1200 LMT.
Q28. The Hour Angle (Greenwich Hour Angle) of a celestial body is analogous to what on Earth?
- A.Latitude
- B.Longitude✓
- C.Co-latitude
- D.UTC
Why: GHA is measured westward from the Greenwich meridian from 0° to 360°, exactly analogous to longitude on Earth. A body with GHA 050° is transiting the 050°W meridian, the same way a position has longitude.
Q29. The main reason that day and night have different durations throughout the year is due to:
- A.The Earth's rotation
- B.The relative speed of the Sun along the ecliptic
- C.The inclination of the ecliptic to the Equator✓
- D.The gravitational effect of the Sun and Moon on the Earth's rotation speed
Why: The seasons and varying daylight lengths are caused primarily by the inclination (tilt) of the Earth's axis — 23.5° to the perpendicular of the orbital plane. This means the Sun's declination changes throughout the year, giving varying day length at different latitudes.
Q30. What is the highest latitude at which the Sun can be vertically overhead?
- A.23.5°✓
- B.66.5°
- C.45°
- D.90°
Why: The Sun can only be directly overhead (at the zenith) between latitudes 23.5°N (Tropic of Cancer) and 23.5°S (Tropic of Capricorn), because that is the maximum declination the Sun reaches in its annual cycle.
Q31. What is the highest latitude listed below at which the Sun will rise above the horizon and set every day?
- A.68°N
- B.66°N✓
- C.62°N
- D.72°N
Why: The Arctic Circle is at 66.5°N. At latitudes poleward of the Arctic Circle, there are days when the Sun never rises (polar night) or never sets (midnight sun). At 66°N (just equatorward of the Arctic Circle), the Sun will rise and set every day of the year.
Q32. What is the highest latitude listed below at which the sun will reach an altitude of 90° above the horizon at some time during the year?
- A.0°
- B.45°
- C.66°
- D.23°✓
Why: Correct answer: D. Topic: The Solar System.
Q33. Assuming mid-latitudes (40° to 50° N/S). At which time of year is the relationship between the length of day and night, as well as the rate of change of declination of the sun, changing at the greatest rate?
- A.Summer solstice and spring equinox
- B.Spring equinox and autumn equinox✓
- C.Summer solstice and winter solstice
- D.Winter solstice and autumn equinox
Why: Correct answer: B. Topic: The Solar System.
Q34. What is the approximate date of perihelion, when the Earth is nearest to the Sun?
- A.Beginning of January✓
- B.End of December
- C.Beginning of July
- D.End of March
Why: Correct answer: A. Topic: The Solar System.
Q35. At what approximate date is the earth furthest from the sun (aphelion)?
- A.Beginning of July✓
- B.End of December
- C.Beginning of January
- D.End of September
Why: Correct answer: A. Topic: The Solar System.
Q36. Seasons are due to the:
- A.Earth's elliptical orbit around the Sun
- B.inclination of the polar axis with the ecliptic plane✓
- C.Earth's rotation on its polar axis
- D.variable distance between Earth and Sun
Why: Correct answer: B. Topic: The Solar System.
Q37. A great circle track joins position A (59°S 141°W) and B (61°S 148°W). What is the difference between the great circle track at A and B?
- A.it increases by 6°✓
- B.it decreases by 6°
- C.it increases by 3°
- D.it decreases by 3°
Why: Correct answer: A. Topic: The Earth.
Q38. Given: Value for the ellipticity of the Earth is 1/297. Earth's semi-major axis, as measured at the equator, equals 6378.4 km. What is the semi-minor axis (km) of the earth at the axis of the Poles?
- A.6 356.9✓
- B.6 378.4
- C.6 367.0
- D.6 399.9
Why: Correct answer: A. Topic: The Earth.
Q39. At what approximate latitude is the length of one minute of arc along a meridian equal to one NM (1852 m) correct?
- A.45°✓
- B.0°
- C.90°
- D.30°
Why: Correct answer: A. Topic: The Earth.
Q40. The maximum difference between geocentric and geodetic latitude occurs at about:
- A.90° North and South
- B.60° North and South
- C.45° North and South✓
- D.0° North and South (equator)
Why: Correct answer: C. Topic: The Earth.
Q41. What is the UTC time of sunrise in Vancouver, British Columbia, Canada (49N 123 30W) on the 6th December?
- A.2324 UTC
- B.0724 UTC
- C.1552 UTC✓
- D.0738 UTC
Why: Correct answer: C. Topic: The Earth.
Q42. In order to fly from position A (10o00N, 030o00W) to position B (30o00N), 050o00W), maintaining a constant true course, it is necessary to fly:
- A.the great-circle route
- B.the constant average drift route
- C.a rhumb line track✓
- D.a straight line plotted on a Lambert chart
Why: Correct answer: C. Topic: The Earth.
Q43. The diameter of the Earth is approximately:
- A.18 500 km
- B.6 350 km
- C.12 700 km✓
- D.40 000 km
Why: Correct answer: C. Topic: The Earth.
Q44. At what approximate date is the earth closest to the sun (perihelion)?
- A.End of June
- B.End of March
- C.Beginning of July
- D.Beginning of January✓
Why: Correct answer: D. Topic: The Earth.
Q45. In which two months of the year is the difference between the transit of the Apparent Sun and mean Sun across the Greenwich Meridian the greatest?
- A.March and September
- B.February and November✓
- C.June and December
- D.April and August
Why: Correct answer: B. Topic: The Earth.
Q46. The circumference of the parallel of latitude at 60°N is approximately:
- A.10 800 NM✓
- B.18 706 NM
- C.20 000 NM
- D.34 641 NM
Why: Correct answer: A. Topic: The Earth.
Q47. Parallels of latitude, except the equator are:
- A.both Rhumb lines and Great circles
- B.Great circles
- C.Rhumb lines✓
- D.are neither Rhumb lines nor Great circles
Why: Correct answer: C. Topic: The Earth.
Q48. The angle between the plane of the ecliptic and the plane of equator is approximately:
- A.27.5°
- B.25.3°
- C.23.5°✓
- D.66.5°
Why: Correct answer: C. Topic: The Earth.
Q49. Given: The coordinates of the heliport at Issy les Moulineaux are: N48o50 E002o16.5 The coordinates of the antipodes are:
- A.S41o10 W177o43.5
- B.S48o50 E177o43.5
- C.S48o50 W177o43.5✓
- D.S41o10 E177o43.5
Why: Correct answer: C. Topic: The Earth.
Q50. An aircraft at latitude 02o20N tracks 180o(T) for 685 km. On completion of the flight the latitude will be:
- A.03o50S✓
- B.04o10S
- C.04o30S
- D.09o05S
Why: Correct answer: A. Topic: The Earth.
Q51. An aircraft departing A(N40° 00'E080o00') flies a constant true track of 270° at a ground speed of 120 kt. What are the coordinates of the position reached in 6 HR?
- A.N40° 00' E068° 10'
- B.N40° 00' E064° 20'✓
- C.N40° 00' E070° 30'
- D.N40° 00' E060° 00'
Why: Correct answer: B. Topic: The Earth.
Q52. If an aeroplane was to circle around the Earth following parallel 60°N at a ground speed of 480 kt. In order to circle around the Earth along the equator in the same amount of time, it should fly at a ground speed of:
- A.550 kt
- B.240 kt
- C.960 kt✓
- D.480 kt
Why: Correct answer: C. Topic: The Earth.
Q53. The angle between the true great-circle track and the true rhumb-line track joining the following points: A (60°S 165°W) B (60°S 177°E), at the place of departure A, is:
- A.7.8°✓
- B.9°
- C.15.6°
- D.5.2°
Why: Correct answer: A. Topic: The Earth.
Q54. An aircraft flies the following rhumb line tracks and distances from position 04o00N 030o00W: 600 NM South, then 600 NM East, then 600 NM North, then 600 NM West. The final position of the aircraft is:
- A.04o00N 029o58W✓
- B.04o00N 030o02W
- C.04o00N 030o00W
- D.03o58N 030o02W
Why: Correct answer: A. Topic: The Earth.
Q55. Which of the following statements concerning the earth's magnetic field is completely correct?
- A.Dip is the angle between total magnetic field and vertical field component
- B.The blue pole of the earth's magnetic field is situated in North Canada✓
- C.At the earth's magnetic equator, the inclination varies depending on whether the geographic equator is north or south of the magnetic equator
- D.The earth's magnetic field can be classified as transient semi-permanent or permanent
Why: Correct answer: B. Topic: The Earth.
Q56. What is the initial great circle direction from 45°N 14o12W to 45°N 12o48E?
- A.86.5° (T)
- B.80.4° (T)✓
- C.090° (M)
- D.270° (M)
Why: Correct answer: B. Topic: The Earth.
Q57. You are flying from A (50n 10W) to B (58N 02E). What is the Convergency between A and B?
- A.6.5°
- B.9.7°✓
- C.10.2°
- D.6.8°
Why: Correct answer: B. Topic: The Earth.
Q58. Radio bearings:
- A.are Rhumb lines
- B.cut all meridians at the same angle
- C.are Great circles✓
- D.are lines of fixed direction
Why: Correct answer: C. Topic: The Earth.
Q59. How many nm are equivalent to 1° of arc of latitude:
- A.1 nm
- B.15 nm
- C.60 nm✓
- D.600 nm
Why: Correct answer: C. Topic: The Earth.
Q60. The earth may be referred to as:
- A.round
- B.an oblate spheroid✓
- C.a globe
- D.elliptical
Why: Correct answer: B. Topic: The Earth.
Q61. What is the standard formula for convergency?
- A.Convergency = dial x sin mean latitude
- B.Convergency = dial x cos mean latitude
- C.Convergency – diong x cos mean latitude
- D.Convergency = diong x sin mean latitude✓
Why: Correct answer: D. Topic: The Earth.
Q62. A line which cuts all meridians at the same angle is called a:
- A.Line of variation
- B.Great circle
- C.Rhumb line✓
- D.Agonic line
Why: Correct answer: C. Topic: The Earth.
Q63. A Parallel of Latitude is a:
- A.Great circle
- B.Rhumb line✓
- C.Small circle
- D.Meridian of tangency
Why: Correct answer: B. Topic: The Earth.
Q64. The shortest distance between 2 point of the surface of the earth is:
- A.a great circle✓
- B.the arc of a great circle
- C.half the rhumb line distance
- D.Rhumb line
Why: Correct answer: A. Topic: The Earth.
Q65. Generally what line lies closer to the pole?
- A.Rhumb line
- B.Orthodromic line✓
- C.Equator
- D.The rhumb line or great circle depending on the chart used
Why: Correct answer: B. Topic: The Earth.
Q66. The Earth is:
- A.A sphere which has a larger polar circumference than equatorial circumference
- B.A sphere whose centre is equidistant (the same distance) from the Poles and the Equator
- C.Considered to be a perfect sphere as far as navigation is concerned✓
- D.None of the above statements is correct
Why: Correct answer: C. Topic: The Earth.
Q67. At what time of the year is the Earth at its furthest point from the sun (aphelion)?
- A.Early July✓
- B.Late December
- C.Early January
- D.Mid-June
Why: Correct answer: A. Topic: The Earth.
Q68. (Refer to figure 061-14) When it is 1000 Standard Time in Kuwait, the Standard time in Algeria :
- A.0700
- B.1200
- C.1300
- D.0800✓
Why: Correct answer: D. Topic: Time and time conversions.
Q69. The duration of civil twilight is the time:
- A.between sunset and when the centre of the sun is 12° below the true horizon
- B.agreed by the international aeronautical authorities which is 12 minutes
- C.needed by the sun to move from the apparent height of 0° to the apparent height of 6°
- D.between sunset and when the centre of the sun is 6° below the true horizon✓
Why: Correct answer: D. Topic: Time and time conversions.
Q70. (Refer to figures 061-13 and 061-15) An aircraft takes off from Guam at 2300 Standard Time on 30 April local date. After a flight of 11 HR 15 MIN it lands at Los Angeles (California). What is the Standard Time and local date of arrival (assume summer time rules apply)?
- A.1715 on 30 April✓
- B.1215 on 1 May
- C.1315 on 1 May
- D.1615 on 30 April
Why: Correct answer: A. Topic: Time and time conversions.
Q71. What is the definition of EAT?
- A.Estimated on-blocks arrival time
- B.Estimated time overhead the destination airfield
- C.Estimated initial approach fix time✓
- D.Estimated final approach fix time
Why: Correct answer: C. Topic: Time and time conversions.
Q72. Which is the highest latitude listed below at which the sun will rise above the horizon and set every day?
- A.62°
- B.68°
- C.72°
- D.66°✓
Why: Correct answer: D. Topic: Time and time conversions.
Q73. On the 27th of February, at 52°S and 040°E, the sunrise is at 0243 UTC. On the same day, at 52°S and 035°W, the sunrise is at:
- A.2143 UTC
- B.0243 UTC
- C.0743 UTC✓
- D.0523 UTC
Why: Correct answer: C. Topic: Time and time conversions.
Q74. (Refer to figures 061-13 and 061-15) At 1200 Standard Time on the 10th of July in Queensland, Australia, what is the Standard Time in Hawaii, USA?
- A.1200 ST 10 July
- B.1000 ST 10 July
- C.1600 ST 09 July✓
- D.0200 ST 10 July
Why: Correct answer: C. Topic: Time and time conversions.
Q75. What is the local mean time, position 65o25N 123o45W at 2200 UTC?
- A.1345✓
- B.2200
- C.0615
- D.0815
Why: Correct answer: A. Topic: Time and time conversions.
Q76. The main reason that day and night, throughout the year, have different duration is due to the:
- A.inclination of the ecliptic to the equator✓
- B.earth's rotation
- C.relative speed of the sun along the ecliptic
- D.gravitational effect of the sun and moon on the speed of rotation of the earth
Why: Correct answer: A. Topic: Time and time conversions.
Q77. The Local Mean Time at longitude 095o20W at 0000 UTC, is:
- A.1738:40 same day
- B.0621:20 same day
- C.1738:40 previous day✓
- D.0621:20 previous day
Why: Correct answer: C. Topic: Time and time conversions.
Q78. Civil twilight is defined by:
- A.sun altitude is 12° below the celestial horizon
- B.sun altitude is 18° below the celestial horizon
- C.sun upper edge tangential to horizon
- D.sun altitude is 6° below the celestial horizon✓
Why: Correct answer: D. Topic: Time and time conversions.
Q79. (Refer to figure 061-12) The UTC of sunrise on 6 December at WINNIPEG (Canada) (49° 50'N 097° 30'W) is:
- A.0930
- B.0113
- C.2230
- D.1413✓
Why: Correct answer: D. Topic: Time and time conversions.
Q80. (Refer to figure 061-04) Given: TAS is 120 kt ATA 'X' 1232 UTC ETA 'Y' 1247 UTC ATA 'Y' is 1250 UTC What is ETA 'Z'?
- A.1257 UTC
- B.1302 UTC✓
- C.1300 UTC
- D.1303 UTC
Why: Correct answer: B. Topic: Time and time conversions.
Q81. In 8 hours and 8 minutes the mean sun has moved how many degrees (o) along the celestial equator?
- A.18°
- B.148°
- C.122°✓
- D.56°
Why: Correct answer: C. Topic: Time and time conversions.
Q82. Morning Civil twilight begins when:
- A.the sun's upper edge is tangential to the celestial horizon
- B.the centre of the sun is 12° below the celestial horizon
- C.the centre of the sun is 18° below the celestial horizon
- D.the centre of the sun is 6° below the celestial horizon✓
Why: Correct answer: D. Topic: Time and time conversions.
Q83. When the time is 1400 LMT at 90° West, it is:
- A.1400 LMT at 90° East
- B.1200 LMT at 120° West✓
- C.1000 LMT at 60° West
- D.0600 LMT at the Prime meridian
Why: Correct answer: B. Topic: Time and time conversions.
Q84. When the time is 2000 UTC, it is:
- A.1400 LMT at 90° West✓
- B.2400 LMT at 120° West
- C.1200 LMT at 60° East
- D.0800 LMT at the Prime meridian
Why: Correct answer: A. Topic: Time and time conversions.
Q85. Which of the following alternatives is correct when you cross the international date line?
- A.The date will increase if you are crossing on a westerly heading✓
- B.The date will increase if you are crossing on a easterly heading
- C.The date will always be the same
- D.If you are crossing from westerly longitude to easterly longitude the date will remain the same
Why: Correct answer: A. Topic: Time and time conversions.
Q86. On 27 Feb, at S5210.0 E04000.0, the sunrise is at 0230 UTC. On the same day, at S5210.0 W03500.0, the sunrise is at:
- A.0230 UTC
- B.0510 UTC
- C.0730 UTC✓
- D.2130 UTC
Why: Correct answer: C. Topic: Time and time conversions.
Q87. The UTC of the end of Evening Civil Twilight in position N51000' W008000' on 15 August is:
- A.1928 UTC
- B.1944 UTC
- C.2000 UTC✓
- D.2032 UTC
Why: Correct answer: C. Topic: Time and time conversions.
Q88. (Refer to figures 061-13 and 061-15) If it is 1200 Standard Time on 10th July in Queensland, Australia, the Standard Time in Hawaii, USA is:
- A.1200ST 10 July
- B.1000ST 10 July
- C.1600ST 09 July✓
- D.0200ST 10 July
Why: Correct answer: C. Topic: Time and time conversions.
Q89. The months in which the difference between apparent noon and mean noon is greatest are:
- A.February and November✓
- B.January and July
- C.March and September
- D.June and December
Why: Correct answer: A. Topic: Time and time conversions.
Q90. (Refer to figures 061-13 and 061-15) What is the Standard Time in Hawaii when it is 0600 ST on the 16th July in Queensland, Australia?
- A.1000 ST 15th July✓
- B.2000 ST 15th July
- C.1000 ST 16th July
- D.1000 ST 17th July
Why: Correct answer: A. Topic: Time and time conversions.
Q91. Isogrives are lines that connect positions that have:
- A.the same horizontal magnetic field strength
- B.the same grivation✓
- C.the same variation
- D.0° magnetic dip
Why: Correct answer: B. Topic: Distances.
Q92. The north and south magnetic poles are the only positions on the earth's surface where:
- A.a freely suspended compass needle will stand horizontal
- B.isogonals converge
- C.a freely suspended compass needle will stand vertical✓
- D.the value of magnetic variation equals 90°
Why: Correct answer: C. Topic: Distances.
Q93. The lines on the earth's surface that join points of equal magnetic variation are called:
- A.isogrives
- B.isoclines
- C.isogonals✓
- D.isotachs
Why: Correct answer: C. Topic: Distances.
Q94. A great circle on the Earth running from the North Pole to the South Pole is called:
- A.a longitude
- B.a parallel of latitude
- C.a difference of longitude
- D.a meridian✓
Why: Correct answer: D. Topic: Distances.
Q95. An aircraft is following the 45°N parallel of latitude. The track followed is a:
- A.constant-heading track
- B.rhumb line✓
- C.great circle
- D.constant-drift track
Why: Correct answer: B. Topic: Distances.
Q96. How does the convergency of any two meridians on the Earth change with varying latitude?
- A.It changes as cosine of latitude
- B.It changes as sine of latitude✓
- C.It increases with decrease of latitude
- D.It is of constant value and does not change with latitude
Why: Correct answer: B. Topic: Distances.
Q97. How many small circles can be drawn between any two points on a sphere?
- A.One
- B.None
- C.An unlimited number✓
- D.Two
Why: Correct answer: C. Topic: Distances.
Q98. If you are flying along a parallel of latitude, you are flying:
- A.a great circle track
- B.on a north-south track
- C.on a track which is constantly changing direction
- D.a rhumb line track✓
Why: Correct answer: D. Topic: Distances.
Q99. In which occasions does the rhumb line track and the great circle track coincide on the surface of the Earth?
- A.On East-West tracks in polar areas
- B.On high latitude tracks directly East-West
- C.On East-West tracks in the northern hemisphere north of the magnetic equator
- D.On tracks directly North-South and on East-West tracks along the Equator✓
Why: Correct answer: D. Topic: Distances.
Q100. When flying on a westerly great circle track in the Southern Hemisphere you will:
- A.fly a spiral and finally end up at the south pole
- B.experience an increase in the value of true track✓
- C.always have the rhumb line track between the departure point and the destination to the left of your great circle track
- D.experience a decrease in the value of true track
Why: Correct answer: B. Topic: Distances.
Q101. How many feet are there in 1 sm?
- A.3.280 ft
- B.5.280 ft✓
- C.6.080 ft
- D.1.000 ft
Why: Correct answer: B. Topic: Distance.
Q102. How many feet are there in a nm?
- A.3.280 ft
- B.5.280 ft
- C.6.080 ft✓
- D.1.000 ft
Why: Correct answer: C. Topic: Distance.
Q103. How many feet are there in a km?
- A.3.280 ft✓
- B.5.280 ft
- C.6.080 ft
- D.1.000 ft
Why: Correct answer: A. Topic: Distance.
Q104. How many centimetres are equivalent to 36.25 inches?
- A.92.08 cm✓
- B.0.014 m
- C.14.27 cm
- D.11.05 cm
Why: Correct answer: A. Topic: Distance.
Q105. How many feet are equivalent to 9.5 km?
- A.31.160 ft✓
- B.50.160 ft
- C.57.760 ft
- D.9.500 ft
Why: Correct answer: A. Topic: Distance.
Q106. The International Nautical Mile defined by ICAO is equivalent to ___ m.
- A.1.582m
- B.1.652m
- C.1.852m✓
- D.1.962m
Why: Correct answer: C. Topic: Distance.
Q107. A nautical mile is:
- A.1609 metres
- B.1852 metres✓
- C.1012 metres
- D.1500 metres
Why: Correct answer: B. Topic: Distance.
Q108. The distance along a meridian between 63o55'N and 13o47'S is:
- A.3008 NM
- B.7702 NM
- C.5008 NM
- D.4662 NM✓
Why: Correct answer: D. Topic: Distance.
Q109. What is the length of one degree of longitude at latitude 60° South?
- A.30 NM✓
- B.52 NM
- C.60 NM
- D.90 NM
Why: Correct answer: A. Topic: Distance.
Q110. What is the rhumb line distance, in nautical miles, between two positions on latitude 60°N, that are separated by 10° of longitude?
- A.300 NM✓
- B.520 NM
- C.600 NM
- D.866 NM
Why: Correct answer: A. Topic: Distance.